mashup?

Mashups combine multiple existing copyrighted works into a new creation. Because they incorporate substantial portions of original works, they are generally considered derivative works. Under copyright law, creating and distributing a derivative work typically requires permission from the copyright holders of the original content. Without such permission, the mashup creator could be infringing on the original creators' rights. While fair use can be a defense, it is a complex legal doctrine and not an automatic protection for all transformative uses; it depends on a four-factor analysis, and courts often find that mashups, especially those used for commercial purposes, do not qualify.